Please also split out the MCE printk change you did in the first patch - even if it's a oneliner we want the first patch to only include changes focused to the primary purpose alone: the introduction of x86_cpu::microcode_version.

Also, please split the first patch into two other parts: a first one that factors out the Intel microcode-version MSR function into a separate function, and the second patch that introduces the x86_cpu::microcode_version field and fills it in in the CPU detection code and keeps it updated in the microcode driver.